Issues With Some WMV profiles in Silverlight

Found a few bugs in the way that Silverlight1.0 plays video.

Will perform definitive tests tomorrow – but looks like a pixel aspect ration that is not 1:1 will prevent video from rendering. This is a shame because there is a trick you can do that radically reduces video bandwidth if you tweak your PAR.

Of other note…

Sometimes audio does not stop playing after the browser is closed.

ASF files seem to work. Extension does not matter as long as codec is supported.

At one point during the test, all video playback in Silverlight (in IE) failed completely. Was still able to play video in WMP. Was able to recover after closing all instances of IE.

Behavior Rate Aspect Ratio Dimensions Audio Video
No Vision – Just Audio 371 Kbps 21:17 actual, 1.79:1 displayed ?? Windows Media Audio 9.1 48 kbps, 44 kHz, mono (A/V) 2-pass CBR Windows Media Video 9
Good 305 Kbps 4:3 320 x 200 Windows Media Audio 9.1
20 kbps, 22 kHz, stereo 1-pass CBR
Windows Media Video V8
Good 1.06 Mbps 4:3 320 x 200 Windows Media Audio 9
64 kbps, 44 kHz, stereo 2-pass VBR
Windows Media Video 9
Good 340 Kbps 4:3 320 x 200 Windows Media Audio 9.1
32 kbps, 32 kHz, stereo (A/V) 1-pass CBR
Windows Media Video 9
Black Square 340 Kbps 4:3 240 x 180 ACELP.net
16 Kbits/s, 16000Hz, Mono
Windows Media Video V8
Good 98 Kbps 1.46:1 350 x 240 Windows Media Audio 9
32 kbps, 22 kHz, stereo (A/V) 1-pass CBR
Windows Media Video V7
White Square – Just Audio 218 Kbps 13:10 actual, 1.33:1 displayed 208 x 160 Windows Media Audio 9.1
32 kbps, 22 kHz, stereo (A/V) 1-pass CBR
Windows Media Video V7
White Square, No Audio. 248 Kbps 4:3 320 x 240 WM-AUDIO
32 kbps, 22 kHz, stereo
Windows Media MPEG-4 Video V3
White Square, No Audio. 222 Kbps 1.78:1 428 x 240 Windows Media Audio 9.1
32 kbps, 32 kHz, stereo (A/V) 1-pass CBR
Windows Media Video 9
Good 1.22 Mbps 1.76:1 480 x 272 Windows Media Audio 9
64 kbps, 44 kHz, stereo (A/V) 1-pass CBR
Windows Media Video 9
White Square, No Audio. 1.08 Mbps 5:4 actual, 4:3 displayed 720 x 576 Windows Media Audio 9
VBR Quality 75, 44 kHz, stereo 1-pass VBR
Windows Media Video 9
Good 236 Kbps 1.77:1 340 x 192 Windows Media Audio 9.1
32 kbps, 32 kHz, stereo (A/V) 1-pass CBR
Windows Media Video V7
White Square, No Audio. 368 Kbps 4:3 384 x 288 Windows Media Audio V7
40 kbps, 32 kHz, stereo
Windows Media MPEG-4 Video V3

 

 

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About metawrap

CTO Massive Interactive. Ex Computer Whiz Kid - Now Grumpy Old Guru.
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